/* * Copyright (C) 2018-2019, STMicroelectronics - All Rights Reserved * * SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define MAX_HSI_HZ 64000000 #define USB_PHY_48_MHZ 48000000 #define TIMEOUT_US_200MS U(200000) #define TIMEOUT_US_1S U(1000000) #define PLLRDY_TIMEOUT TIMEOUT_US_200MS #define CLKSRC_TIMEOUT TIMEOUT_US_200MS #define CLKDIV_TIMEOUT TIMEOUT_US_200MS #define HSIDIV_TIMEOUT TIMEOUT_US_200MS #define OSCRDY_TIMEOUT TIMEOUT_US_1S const char *stm32mp_osc_node_label[NB_OSC] = { [_LSI] = "clk-lsi", [_LSE] = "clk-lse", [_HSI] = "clk-hsi", [_HSE] = "clk-hse", [_CSI] = "clk-csi", [_I2S_CKIN] = "i2s_ckin", }; enum stm32mp1_parent_id { /* Oscillators are defined in enum stm32mp_osc_id */ /* Other parent source */ _HSI_KER = NB_OSC, _HSE_KER, _HSE_KER_DIV2, _CSI_KER, _PLL1_P, _PLL1_Q, _PLL1_R, _PLL2_P, _PLL2_Q, _PLL2_R, _PLL3_P, _PLL3_Q, _PLL3_R, _PLL4_P, _PLL4_Q, _PLL4_R, _ACLK, _PCLK1, _PCLK2, _PCLK3, _PCLK4, _PCLK5, _HCLK6, _HCLK2, _CK_PER, _CK_MPU, _CK_MCU, _USB_PHY_48, _PARENT_NB, _UNKNOWN_ID = 0xff, }; /* Lists only the parent clock we are interested in */ enum stm32mp1_parent_sel { _I2C12_SEL, _I2C35_SEL, _STGEN_SEL, _I2C46_SEL, _SPI6_SEL, _UART1_SEL, _RNG1_SEL, _UART6_SEL, _UART24_SEL, _UART35_SEL, _UART78_SEL, _SDMMC12_SEL, _SDMMC3_SEL, _QSPI_SEL, _FMC_SEL, _AXIS_SEL, _MCUS_SEL, _USBPHY_SEL, _USBO_SEL, _PARENT_SEL_NB, _UNKNOWN_SEL = 0xff, }; enum stm32mp1_pll_id { _PLL1, _PLL2, _PLL3, _PLL4, _PLL_NB }; enum stm32mp1_div_id { _DIV_P, _DIV_Q, _DIV_R, _DIV_NB, }; enum stm32mp1_clksrc_id { CLKSRC_MPU, CLKSRC_AXI, CLKSRC_MCU, CLKSRC_PLL12, CLKSRC_PLL3, CLKSRC_PLL4, CLKSRC_RTC, CLKSRC_MCO1, CLKSRC_MCO2, CLKSRC_NB }; enum stm32mp1_clkdiv_id { CLKDIV_MPU, CLKDIV_AXI, CLKDIV_MCU, CLKDIV_APB1, CLKDIV_APB2, CLKDIV_APB3, CLKDIV_APB4, CLKDIV_APB5, CLKDIV_RTC, CLKDIV_MCO1, CLKDIV_MCO2, CLKDIV_NB }; enum stm32mp1_pllcfg { PLLCFG_M, PLLCFG_N, PLLCFG_P, PLLCFG_Q, PLLCFG_R, PLLCFG_O, PLLCFG_NB }; enum stm32mp1_pllcsg { PLLCSG_MOD_PER, PLLCSG_INC_STEP, PLLCSG_SSCG_MODE, PLLCSG_NB }; enum stm32mp1_plltype { PLL_800, PLL_1600, PLL_TYPE_NB }; struct stm32mp1_pll { uint8_t refclk_min; uint8_t refclk_max; uint8_t divn_max; }; struct stm32mp1_clk_gate { uint16_t offset; uint8_t bit; uint8_t index; uint8_t set_clr; uint8_t sel; /* Relates to enum stm32mp1_parent_sel */ uint8_t fixed; /* Relates to enum stm32mp1_parent_id */ }; struct stm32mp1_clk_sel { uint16_t offset; uint8_t src; uint8_t msk; uint8_t nb_parent; const uint8_t *parent; }; #define REFCLK_SIZE 4 struct stm32mp1_clk_pll { enum stm32mp1_plltype plltype; uint16_t rckxselr; uint16_t pllxcfgr1; uint16_t pllxcfgr2; uint16_t pllxfracr; uint16_t pllxcr; uint16_t pllxcsgr; enum stm32mp_osc_id refclk[REFCLK_SIZE]; }; /* Clocks with selectable source and non set/clr register access */ #define _CLK_SELEC(off, b, idx, s) \ { \ .offset = (off), \ .bit = (b), \ .index = (idx), \ .set_clr = 0, \ .sel = (s), \ .fixed = _UNKNOWN_ID, \ } /* Clocks with fixed source and non set/clr register access */ #define _CLK_FIXED(off, b, idx, f) \ { \ .offset = (off), \ .bit = (b), \ .index = (idx), \ .set_clr = 0, \ .sel = _UNKNOWN_SEL, \ .fixed = (f), \ } /* Clocks with selectable source and set/clr register access */ #define _CLK_SC_SELEC(off, b, idx, s) \ { \ .offset = (off), \ .bit = (b), \ .index = (idx), \ .set_clr = 1, \ .sel = (s), \ .fixed = _UNKNOWN_ID, \ } /* Clocks with fixed source and set/clr register access */ #define _CLK_SC_FIXED(off, b, idx, f) \ { \ .offset = (off), \ .bit = (b), \ .index = (idx), \ .set_clr = 1, \ .sel = _UNKNOWN_SEL, \ .fixed = (f), \ } #define _CLK_PARENT_SEL(_label, _rcc_selr, _parents) \ [_ ## _label ## _SEL] = { \ .offset = _rcc_selr, \ .src = _rcc_selr ## _ ## _label ## SRC_SHIFT, \ .msk = _rcc_selr ## _ ## _label ## SRC_MASK, \ .parent = (_parents), \ .nb_parent = ARRAY_SIZE(_parents) \ } #define _CLK_PLL(idx, type, off1, off2, off3, \ off4, off5, off6, \ p1, p2, p3, p4) \ [(idx)] = { \ .plltype = (type), \ .rckxselr = (off1), \ .pllxcfgr1 = (off2), \ .pllxcfgr2 = (off3), \ .pllxfracr = (off4), \ .pllxcr = (off5), \ .pllxcsgr = (off6), \ .refclk[0] = (p1), \ .refclk[1] = (p2), \ .refclk[2] = (p3), \ .refclk[3] = (p4), \ } static const uint8_t stm32mp1_clks[][2] = { { CK_PER, _CK_PER }, { CK_MPU, _CK_MPU }, { CK_AXI, _ACLK }, { CK_MCU, _CK_MCU }, { CK_HSE, _HSE }, { CK_CSI, _CSI }, { CK_LSI, _LSI }, { CK_LSE, _LSE }, { CK_HSI, _HSI }, { CK_HSE_DIV2, _HSE_KER_DIV2 }, }; #define NB_GATES ARRAY_SIZE(stm32mp1_clk_gate) static const struct stm32mp1_clk_gate stm32mp1_clk_gate[] = { _CLK_FIXED(RCC_DDRITFCR, 0, DDRC1, _ACLK), _CLK_FIXED(RCC_DDRITFCR, 1, DDRC1LP, _ACLK), _CLK_FIXED(RCC_DDRITFCR, 2, DDRC2, _ACLK), _CLK_FIXED(RCC_DDRITFCR, 3, DDRC2LP, _ACLK), _CLK_FIXED(RCC_DDRITFCR, 4, DDRPHYC, _PLL2_R), _CLK_FIXED(RCC_DDRITFCR, 5, DDRPHYCLP, _PLL2_R), _CLK_FIXED(RCC_DDRITFCR, 6, DDRCAPB, _PCLK4), _CLK_FIXED(RCC_DDRITFCR, 7, DDRCAPBLP, _PCLK4), _CLK_FIXED(RCC_DDRITFCR, 8, AXIDCG, _ACLK), _CLK_FIXED(RCC_DDRITFCR, 9, DDRPHYCAPB, _PCLK4), _CLK_FIXED(RCC_DDRITFCR, 10, DDRPHYCAPBLP, _PCLK4), _CLK_SC_FIXED(RCC_MP_APB1ENSETR, 6, TIM12_K, _PCLK1), _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 14, USART2_K, _UART24_SEL), _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 15, USART3_K, _UART35_SEL), _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 16, UART4_K, _UART24_SEL), _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 17, UART5_K, _UART35_SEL), _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 18, UART7_K, _UART78_SEL), _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 19, UART8_K, _UART78_SEL), _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 21, I2C1_K, _I2C12_SEL), _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 22, I2C2_K, _I2C12_SEL), _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 23, I2C3_K, _I2C35_SEL), _CLK_SC_SELEC(RCC_MP_APB1ENSETR, 24, I2C5_K, _I2C35_SEL), _CLK_SC_FIXED(RCC_MP_APB2ENSETR, 2, TIM15_K, _PCLK2), _CLK_SC_SELEC(RCC_MP_APB2ENSETR, 13, USART6_K, _UART6_SEL), _CLK_SC_SELEC(RCC_MP_APB4ENSETR, 8, DDRPERFM, _UNKNOWN_SEL), _CLK_SC_SELEC(RCC_MP_APB4ENSETR, 15, IWDG2, _UNKNOWN_SEL), _CLK_SC_SELEC(RCC_MP_APB4ENSETR, 16, USBPHY_K, _USBPHY_SEL), _CLK_SC_SELEC(RCC_MP_APB5ENSETR, 0, SPI6_K, _SPI6_SEL), _CLK_SC_SELEC(RCC_MP_APB5ENSETR, 2, I2C4_K, _I2C46_SEL), _CLK_SC_SELEC(RCC_MP_APB5ENSETR, 3, I2C6_K, _I2C46_SEL), _CLK_SC_SELEC(RCC_MP_APB5ENSETR, 4, USART1_K, _UART1_SEL), _CLK_SC_FIXED(RCC_MP_APB5ENSETR, 8, RTCAPB, _PCLK5), _CLK_SC_FIXED(RCC_MP_APB5ENSETR, 11, TZC1, _PCLK5), _CLK_SC_FIXED(RCC_MP_APB5ENSETR, 12, TZC2, _PCLK5), _CLK_SC_FIXED(RCC_MP_APB5ENSETR, 13, TZPC, _PCLK5), _CLK_SC_FIXED(RCC_MP_APB5ENSETR, 15, IWDG1, _PCLK5), _CLK_SC_FIXED(RCC_MP_APB5ENSETR, 16, BSEC, _PCLK5), _CLK_SC_SELEC(RCC_MP_APB5ENSETR, 20, STGEN_K, _STGEN_SEL), _CLK_SC_SELEC(RCC_MP_AHB2ENSETR, 8, USBO_K, _USBO_SEL), _CLK_SC_SELEC(RCC_MP_AHB2ENSETR, 16, SDMMC3_K, _SDMMC3_SEL), _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 0, GPIOA, _UNKNOWN_SEL), _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 1, GPIOB, _UNKNOWN_SEL), _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 2, GPIOC, _UNKNOWN_SEL), _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 3, GPIOD, _UNKNOWN_SEL), _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 4, GPIOE, _UNKNOWN_SEL), _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 5, GPIOF, _UNKNOWN_SEL), _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 6, GPIOG, _UNKNOWN_SEL), _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 7, GPIOH, _UNKNOWN_SEL), _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 8, GPIOI, _UNKNOWN_SEL), _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 9, GPIOJ, _UNKNOWN_SEL), _CLK_SC_SELEC(RCC_MP_AHB4ENSETR, 10, GPIOK, _UNKNOWN_SEL), _CLK_SC_FIXED(RCC_MP_AHB5ENSETR, 0, GPIOZ, _PCLK5), _CLK_SC_FIXED(RCC_MP_AHB5ENSETR, 4, CRYP1, _PCLK5), _CLK_SC_FIXED(RCC_MP_AHB5ENSETR, 5, HASH1, _PCLK5), _CLK_SC_SELEC(RCC_MP_AHB5ENSETR, 6, RNG1_K, _RNG1_SEL), _CLK_SC_FIXED(RCC_MP_AHB5ENSETR, 8, BKPSRAM, _PCLK5), _CLK_SC_SELEC(RCC_MP_AHB6ENSETR, 12, FMC_K, _FMC_SEL), _CLK_SC_SELEC(RCC_MP_AHB6ENSETR, 14, QSPI_K, _QSPI_SEL), _CLK_SC_SELEC(RCC_MP_AHB6ENSETR, 16, SDMMC1_K, _SDMMC12_SEL), _CLK_SC_SELEC(RCC_MP_AHB6ENSETR, 17, SDMMC2_K, _SDMMC12_SEL), _CLK_SC_SELEC(RCC_MP_AHB6ENSETR, 24, USBH, _UNKNOWN_SEL), _CLK_SELEC(RCC_DBGCFGR, 8, CK_DBG, _UNKNOWN_SEL), }; static const uint8_t i2c12_parents[] = { _PCLK1, _PLL4_R, _HSI_KER, _CSI_KER }; static const uint8_t i2c35_parents[] = { _PCLK1, _PLL4_R, _HSI_KER, _CSI_KER }; static const uint8_t stgen_parents[] = { _HSI_KER, _HSE_KER }; static const uint8_t i2c46_parents[] = { _PCLK5, _PLL3_Q, _HSI_KER, _CSI_KER }; static const uint8_t spi6_parents[] = { _PCLK5, _PLL4_Q, _HSI_KER, _CSI_KER, _HSE_KER, _PLL3_Q }; static const uint8_t usart1_parents[] = { _PCLK5, _PLL3_Q, _HSI_KER, _CSI_KER, _PLL4_Q, _HSE_KER }; static const uint8_t rng1_parents[] = { _CSI, _PLL4_R, _LSE, _LSI }; static const uint8_t uart6_parents[] = { _PCLK2, _PLL4_Q, _HSI_KER, _CSI_KER, _HSE_KER }; static const uint8_t uart234578_parents[] = { _PCLK1, _PLL4_Q, _HSI_KER, _CSI_KER, _HSE_KER }; static const uint8_t sdmmc12_parents[] = { _HCLK6, _PLL3_R, _PLL4_P, _HSI_KER }; static const uint8_t sdmmc3_parents[] = { _HCLK2, _PLL3_R, _PLL4_P, _HSI_KER }; static const uint8_t qspi_parents[] = { _ACLK, _PLL3_R, _PLL4_P, _CK_PER }; static const uint8_t fmc_parents[] = { _ACLK, _PLL3_R, _PLL4_P, _CK_PER }; static const uint8_t ass_parents[] = { _HSI, _HSE, _PLL2 }; static const uint8_t mss_parents[] = { _HSI, _HSE, _CSI, _PLL3 }; static const uint8_t usbphy_parents[] = { _HSE_KER, _PLL4_R, _HSE_KER_DIV2 }; static const uint8_t usbo_parents[] = { _PLL4_R, _USB_PHY_48 }; static const struct stm32mp1_clk_sel stm32mp1_clk_sel[_PARENT_SEL_NB] = { _CLK_PARENT_SEL(I2C12, RCC_I2C12CKSELR, i2c12_parents), _CLK_PARENT_SEL(I2C35, RCC_I2C35CKSELR, i2c35_parents), _CLK_PARENT_SEL(STGEN, RCC_STGENCKSELR, stgen_parents), _CLK_PARENT_SEL(I2C46, RCC_I2C46CKSELR, i2c46_parents), _CLK_PARENT_SEL(SPI6, RCC_SPI6CKSELR, spi6_parents), _CLK_PARENT_SEL(UART1, RCC_UART1CKSELR, usart1_parents), _CLK_PARENT_SEL(RNG1, RCC_RNG1CKSELR, rng1_parents), _CLK_PARENT_SEL(UART6, RCC_UART6CKSELR, uart6_parents), _CLK_PARENT_SEL(UART24, RCC_UART24CKSELR, uart234578_parents), _CLK_PARENT_SEL(UART35, RCC_UART35CKSELR, uart234578_parents), _CLK_PARENT_SEL(UART78, RCC_UART78CKSELR, uart234578_parents), _CLK_PARENT_SEL(SDMMC12, RCC_SDMMC12CKSELR, sdmmc12_parents), _CLK_PARENT_SEL(SDMMC3, RCC_SDMMC3CKSELR, sdmmc3_parents), _CLK_PARENT_SEL(QSPI, RCC_QSPICKSELR, qspi_parents), _CLK_PARENT_SEL(FMC, RCC_FMCCKSELR, fmc_parents), _CLK_PARENT_SEL(AXIS, RCC_ASSCKSELR, ass_parents), _CLK_PARENT_SEL(MCUS, RCC_MSSCKSELR, mss_parents), _CLK_PARENT_SEL(USBPHY, RCC_USBCKSELR, usbphy_parents), _CLK_PARENT_SEL(USBO, RCC_USBCKSELR, usbo_parents), }; /* Define characteristic of PLL according type */ #define DIVN_MIN 24 static const struct stm32mp1_pll stm32mp1_pll[PLL_TYPE_NB] = { [PLL_800] = { .refclk_min = 4, .refclk_max = 16, .divn_max = 99, }, [PLL_1600] = { .refclk_min = 8, .refclk_max = 16, .divn_max = 199, }, }; /* PLLNCFGR2 register divider by output */ static const uint8_t pllncfgr2[_DIV_NB] = { [_DIV_P] = RCC_PLLNCFGR2_DIVP_SHIFT, [_DIV_Q] = RCC_PLLNCFGR2_DIVQ_SHIFT, [_DIV_R] = RCC_PLLNCFGR2_DIVR_SHIFT, }; static const struct stm32mp1_clk_pll stm32mp1_clk_pll[_PLL_NB] = { _CLK_PLL(_PLL1, PLL_1600, RCC_RCK12SELR, RCC_PLL1CFGR1, RCC_PLL1CFGR2, RCC_PLL1FRACR, RCC_PLL1CR, RCC_PLL1CSGR, _HSI, _HSE, _UNKNOWN_OSC_ID, _UNKNOWN_OSC_ID), _CLK_PLL(_PLL2, PLL_1600, RCC_RCK12SELR, RCC_PLL2CFGR1, RCC_PLL2CFGR2, RCC_PLL2FRACR, RCC_PLL2CR, RCC_PLL2CSGR, _HSI, _HSE, _UNKNOWN_OSC_ID, _UNKNOWN_OSC_ID), _CLK_PLL(_PLL3, PLL_800, RCC_RCK3SELR, RCC_PLL3CFGR1, RCC_PLL3CFGR2, RCC_PLL3FRACR, RCC_PLL3CR, RCC_PLL3CSGR, _HSI, _HSE, _CSI, _UNKNOWN_OSC_ID), _CLK_PLL(_PLL4, PLL_800, RCC_RCK4SELR, RCC_PLL4CFGR1, RCC_PLL4CFGR2, RCC_PLL4FRACR, RCC_PLL4CR, RCC_PLL4CSGR, _HSI, _HSE, _CSI, _I2S_CKIN), }; /* Prescaler table lookups for clock computation */ /* div = /1 /2 /4 /8 / 16 /64 /128 /512 */ static const uint8_t stm32mp1_mcu_div[16] = { 0, 1, 2, 3, 4, 6, 7, 8, 9, 9, 9, 9, 9, 9, 9, 9 }; /* div = /1 /2 /4 /8 /16 : same divider for PMU and APBX */ #define stm32mp1_mpu_div stm32mp1_mpu_apbx_div #define stm32mp1_apbx_div stm32mp1_mpu_apbx_div static const uint8_t stm32mp1_mpu_apbx_div[8] = { 0, 1, 2, 3, 4, 4, 4, 4 }; /* div = /1 /2 /3 /4 */ static const uint8_t stm32mp1_axi_div[8] = { 1, 2, 3, 4, 4, 4, 4, 4 }; /* RCC clock device driver private */ static unsigned long stm32mp1_osc[NB_OSC]; static struct spinlock reg_lock; static unsigned int gate_refcounts[NB_GATES]; static struct spinlock refcount_lock; static const struct stm32mp1_clk_gate *gate_ref(unsigned int idx) { return &stm32mp1_clk_gate[idx]; } static const struct stm32mp1_clk_sel *clk_sel_ref(unsigned int idx) { return &stm32mp1_clk_sel[idx]; } static const struct stm32mp1_clk_pll *pll_ref(unsigned int idx) { return &stm32mp1_clk_pll[idx]; } static int stm32mp1_lock_available(void) { /* The spinlocks are used only when MMU is enabled */ return (read_sctlr() & SCTLR_M_BIT) && (read_sctlr() & SCTLR_C_BIT); } static void stm32mp1_clk_lock(struct spinlock *lock) { if (stm32mp1_lock_available() == 0U) { return; } /* Assume interrupts are masked */ spin_lock(lock); } static void stm32mp1_clk_unlock(struct spinlock *lock) { if (stm32mp1_lock_available() == 0U) { return; } spin_unlock(lock); } bool stm32mp1_rcc_is_secure(void) { uintptr_t rcc_base = stm32mp_rcc_base(); return (mmio_read_32(rcc_base + RCC_TZCR) & RCC_TZCR_TZEN) != 0; } bool stm32mp1_rcc_is_mckprot(void) { uintptr_t rcc_base = stm32mp_rcc_base(); return (mmio_read_32(rcc_base + RCC_TZCR) & RCC_TZCR_MCKPROT) != 0; } void stm32mp1_clk_rcc_regs_lock(void) { stm32mp1_clk_lock(®_lock); } void stm32mp1_clk_rcc_regs_unlock(void) { stm32mp1_clk_unlock(®_lock); } static unsigned long stm32mp1_clk_get_fixed(enum stm32mp_osc_id idx) { if (idx >= NB_OSC) { return 0; } return stm32mp1_osc[idx]; } static int stm32mp1_clk_get_gated_id(unsigned long id) { unsigned int i; for (i = 0U; i < NB_GATES; i++) { if (gate_ref(i)->index == id) { return i; } } ERROR("%s: clk id %d not found\n", __func__, (uint32_t)id); return -EINVAL; } static enum stm32mp1_parent_sel stm32mp1_clk_get_sel(int i) { return (enum stm32mp1_parent_sel)(gate_ref(i)->sel); } static enum stm32mp1_parent_id stm32mp1_clk_get_fixed_parent(int i) { return (enum stm32mp1_parent_id)(gate_ref(i)->fixed); } static int stm32mp1_clk_get_parent(unsigned long id) { const struct stm32mp1_clk_sel *sel; uint32_t j, p_sel; int i; enum stm32mp1_parent_id p; enum stm32mp1_parent_sel s; uintptr_t rcc_base = stm32mp_rcc_base(); for (j = 0U; j < ARRAY_SIZE(stm32mp1_clks); j++) { if (stm32mp1_clks[j][0] == id) { return (int)stm32mp1_clks[j][1]; } } i = stm32mp1_clk_get_gated_id(id); if (i < 0) { panic(); } p = stm32mp1_clk_get_fixed_parent(i); if (p < _PARENT_NB) { return (int)p; } s = stm32mp1_clk_get_sel(i); if (s == _UNKNOWN_SEL) { return -EINVAL; } if (s >= _PARENT_SEL_NB) { panic(); } sel = clk_sel_ref(s); p_sel = (mmio_read_32(rcc_base + sel->offset) & sel->msk) >> sel->src; if (p_sel < sel->nb_parent) { return (int)sel->parent[p_sel]; } return -EINVAL; } static unsigned long stm32mp1_pll_get_fref(const struct stm32mp1_clk_pll *pll) { uint32_t selr = mmio_read_32(stm32mp_rcc_base() + pll->rckxselr); uint32_t src = selr & RCC_SELR_REFCLK_SRC_MASK; return stm32mp1_clk_get_fixed(pll->refclk[src]); } /* * pll_get_fvco() : return the VCO or (VCO / 2) frequency for the requested PLL * - PLL1 & PLL2 => return VCO / 2 with Fpll_y_ck = FVCO / 2 * (DIVy + 1) * - PLL3 & PLL4 => return VCO with Fpll_y_ck = FVCO / (DIVy + 1) * => in all cases Fpll_y_ck = pll_get_fvco() / (DIVy + 1) */ static unsigned long stm32mp1_pll_get_fvco(const struct stm32mp1_clk_pll *pll) { unsigned long refclk, fvco; uint32_t cfgr1, fracr, divm, divn; uintptr_t rcc_base = stm32mp_rcc_base(); cfgr1 = mmio_read_32(rcc_base + pll->pllxcfgr1); fracr = mmio_read_32(rcc_base + pll->pllxfracr); divm = (cfgr1 & (RCC_PLLNCFGR1_DIVM_MASK)) >> RCC_PLLNCFGR1_DIVM_SHIFT; divn = cfgr1 & RCC_PLLNCFGR1_DIVN_MASK; refclk = stm32mp1_pll_get_fref(pll); /* * With FRACV : * Fvco = Fck_ref * ((DIVN + 1) + FRACV / 2^13) / (DIVM + 1) * Without FRACV * Fvco = Fck_ref * ((DIVN + 1) / (DIVM + 1) */ if ((fracr & RCC_PLLNFRACR_FRACLE) != 0U) { uint32_t fracv = (fracr & RCC_PLLNFRACR_FRACV_MASK) >> RCC_PLLNFRACR_FRACV_SHIFT; unsigned long long numerator, denominator; numerator = (((unsigned long long)divn + 1U) << 13) + fracv; numerator = refclk * numerator; denominator = ((unsigned long long)divm + 1U) << 13; fvco = (unsigned long)(numerator / denominator); } else { fvco = (unsigned long)(refclk * (divn + 1U) / (divm + 1U)); } return fvco; } static unsigned long stm32mp1_read_pll_freq(enum stm32mp1_pll_id pll_id, enum stm32mp1_div_id div_id) { const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); unsigned long dfout; uint32_t cfgr2, divy; if (div_id >= _DIV_NB) { return 0; } cfgr2 = mmio_read_32(stm32mp_rcc_base() + pll->pllxcfgr2); divy = (cfgr2 >> pllncfgr2[div_id]) & RCC_PLLNCFGR2_DIVX_MASK; dfout = stm32mp1_pll_get_fvco(pll) / (divy + 1U); return dfout; } static unsigned long get_clock_rate(int p) { uint32_t reg, clkdiv; unsigned long clock = 0; uintptr_t rcc_base = stm32mp_rcc_base(); switch (p) { case _CK_MPU: /* MPU sub system */ reg = mmio_read_32(rcc_base + RCC_MPCKSELR); switch (reg & RCC_SELR_SRC_MASK) { case RCC_MPCKSELR_HSI: clock = stm32mp1_clk_get_fixed(_HSI); break; case RCC_MPCKSELR_HSE: clock = stm32mp1_clk_get_fixed(_HSE); break; case RCC_MPCKSELR_PLL: clock = stm32mp1_read_pll_freq(_PLL1, _DIV_P); break; case RCC_MPCKSELR_PLL_MPUDIV: clock = stm32mp1_read_pll_freq(_PLL1, _DIV_P); reg = mmio_read_32(rcc_base + RCC_MPCKDIVR); clkdiv = reg & RCC_MPUDIV_MASK; if (clkdiv != 0U) { clock /= stm32mp1_mpu_div[clkdiv]; } break; default: break; } break; /* AXI sub system */ case _ACLK: case _HCLK2: case _HCLK6: case _PCLK4: case _PCLK5: reg = mmio_read_32(rcc_base + RCC_ASSCKSELR); switch (reg & RCC_SELR_SRC_MASK) { case RCC_ASSCKSELR_HSI: clock = stm32mp1_clk_get_fixed(_HSI); break; case RCC_ASSCKSELR_HSE: clock = stm32mp1_clk_get_fixed(_HSE); break; case RCC_ASSCKSELR_PLL: clock = stm32mp1_read_pll_freq(_PLL2, _DIV_P); break; default: break; } /* System clock divider */ reg = mmio_read_32(rcc_base + RCC_AXIDIVR); clock /= stm32mp1_axi_div[reg & RCC_AXIDIV_MASK]; switch (p) { case _PCLK4: reg = mmio_read_32(rcc_base + RCC_APB4DIVR); clock >>= stm32mp1_apbx_div[reg & RCC_APBXDIV_MASK]; break; case _PCLK5: reg = mmio_read_32(rcc_base + RCC_APB5DIVR); clock >>= stm32mp1_apbx_div[reg & RCC_APBXDIV_MASK]; break; default: break; } break; /* MCU sub system */ case _CK_MCU: case _PCLK1: case _PCLK2: case _PCLK3: reg = mmio_read_32(rcc_base + RCC_MSSCKSELR); switch (reg & RCC_SELR_SRC_MASK) { case RCC_MSSCKSELR_HSI: clock = stm32mp1_clk_get_fixed(_HSI); break; case RCC_MSSCKSELR_HSE: clock = stm32mp1_clk_get_fixed(_HSE); break; case RCC_MSSCKSELR_CSI: clock = stm32mp1_clk_get_fixed(_CSI); break; case RCC_MSSCKSELR_PLL: clock = stm32mp1_read_pll_freq(_PLL3, _DIV_P); break; default: break; } /* MCU clock divider */ reg = mmio_read_32(rcc_base + RCC_MCUDIVR); clock >>= stm32mp1_mcu_div[reg & RCC_MCUDIV_MASK]; switch (p) { case _PCLK1: reg = mmio_read_32(rcc_base + RCC_APB1DIVR); clock >>= stm32mp1_apbx_div[reg & RCC_APBXDIV_MASK]; break; case _PCLK2: reg = mmio_read_32(rcc_base + RCC_APB2DIVR); clock >>= stm32mp1_apbx_div[reg & RCC_APBXDIV_MASK]; break; case _PCLK3: reg = mmio_read_32(rcc_base + RCC_APB3DIVR); clock >>= stm32mp1_apbx_div[reg & RCC_APBXDIV_MASK]; break; case _CK_MCU: default: break; } break; case _CK_PER: reg = mmio_read_32(rcc_base + RCC_CPERCKSELR); switch (reg & RCC_SELR_SRC_MASK) { case RCC_CPERCKSELR_HSI: clock = stm32mp1_clk_get_fixed(_HSI); break; case RCC_CPERCKSELR_HSE: clock = stm32mp1_clk_get_fixed(_HSE); break; case RCC_CPERCKSELR_CSI: clock = stm32mp1_clk_get_fixed(_CSI); break; default: break; } break; case _HSI: case _HSI_KER: clock = stm32mp1_clk_get_fixed(_HSI); break; case _CSI: case _CSI_KER: clock = stm32mp1_clk_get_fixed(_CSI); break; case _HSE: case _HSE_KER: clock = stm32mp1_clk_get_fixed(_HSE); break; case _HSE_KER_DIV2: clock = stm32mp1_clk_get_fixed(_HSE) >> 1; break; case _LSI: clock = stm32mp1_clk_get_fixed(_LSI); break; case _LSE: clock = stm32mp1_clk_get_fixed(_LSE); break; /* PLL */ case _PLL1_P: clock = stm32mp1_read_pll_freq(_PLL1, _DIV_P); break; case _PLL1_Q: clock = stm32mp1_read_pll_freq(_PLL1, _DIV_Q); break; case _PLL1_R: clock = stm32mp1_read_pll_freq(_PLL1, _DIV_R); break; case _PLL2_P: clock = stm32mp1_read_pll_freq(_PLL2, _DIV_P); break; case _PLL2_Q: clock = stm32mp1_read_pll_freq(_PLL2, _DIV_Q); break; case _PLL2_R: clock = stm32mp1_read_pll_freq(_PLL2, _DIV_R); break; case _PLL3_P: clock = stm32mp1_read_pll_freq(_PLL3, _DIV_P); break; case _PLL3_Q: clock = stm32mp1_read_pll_freq(_PLL3, _DIV_Q); break; case _PLL3_R: clock = stm32mp1_read_pll_freq(_PLL3, _DIV_R); break; case _PLL4_P: clock = stm32mp1_read_pll_freq(_PLL4, _DIV_P); break; case _PLL4_Q: clock = stm32mp1_read_pll_freq(_PLL4, _DIV_Q); break; case _PLL4_R: clock = stm32mp1_read_pll_freq(_PLL4, _DIV_R); break; /* Other */ case _USB_PHY_48: clock = USB_PHY_48_MHZ; break; default: break; } return clock; } static void __clk_enable(struct stm32mp1_clk_gate const *gate) { uintptr_t rcc_base = stm32mp_rcc_base(); if (gate->set_clr != 0U) { mmio_write_32(rcc_base + gate->offset, BIT(gate->bit)); } else { mmio_setbits_32(rcc_base + gate->offset, BIT(gate->bit)); } VERBOSE("Clock %d has been enabled", gate->index); } static void __clk_disable(struct stm32mp1_clk_gate const *gate) { uintptr_t rcc_base = stm32mp_rcc_base(); if (gate->set_clr != 0U) { mmio_write_32(rcc_base + gate->offset + RCC_MP_ENCLRR_OFFSET, BIT(gate->bit)); } else { mmio_clrbits_32(rcc_base + gate->offset, BIT(gate->bit)); } VERBOSE("Clock %d has been disabled", gate->index); } static bool __clk_is_enabled(struct stm32mp1_clk_gate const *gate) { uintptr_t rcc_base = stm32mp_rcc_base(); return mmio_read_32(rcc_base + gate->offset) & BIT(gate->bit); } unsigned int stm32mp1_clk_get_refcount(unsigned long id) { int i = stm32mp1_clk_get_gated_id(id); if (i < 0) { panic(); } return gate_refcounts[i]; } void __stm32mp1_clk_enable(unsigned long id, bool secure) { const struct stm32mp1_clk_gate *gate; int i = stm32mp1_clk_get_gated_id(id); unsigned int *refcnt; if (i < 0) { ERROR("Clock %d can't be enabled\n", (uint32_t)id); panic(); } gate = gate_ref(i); refcnt = &gate_refcounts[i]; stm32mp1_clk_lock(&refcount_lock); if (stm32mp_incr_shrefcnt(refcnt, secure) != 0) { __clk_enable(gate); } stm32mp1_clk_unlock(&refcount_lock); } void __stm32mp1_clk_disable(unsigned long id, bool secure) { const struct stm32mp1_clk_gate *gate; int i = stm32mp1_clk_get_gated_id(id); unsigned int *refcnt; if (i < 0) { ERROR("Clock %d can't be disabled\n", (uint32_t)id); panic(); } gate = gate_ref(i); refcnt = &gate_refcounts[i]; stm32mp1_clk_lock(&refcount_lock); if (stm32mp_decr_shrefcnt(refcnt, secure) != 0) { __clk_disable(gate); } stm32mp1_clk_unlock(&refcount_lock); } void stm32mp_clk_enable(unsigned long id) { __stm32mp1_clk_enable(id, true); } void stm32mp_clk_disable(unsigned long id) { __stm32mp1_clk_disable(id, true); } bool stm32mp_clk_is_enabled(unsigned long id) { int i = stm32mp1_clk_get_gated_id(id); if (i < 0) { panic(); } return __clk_is_enabled(gate_ref(i)); } unsigned long stm32mp_clk_get_rate(unsigned long id) { int p = stm32mp1_clk_get_parent(id); if (p < 0) { return 0; } return get_clock_rate(p); } static void stm32mp1_ls_osc_set(bool enable, uint32_t offset, uint32_t mask_on) { uintptr_t address = stm32mp_rcc_base() + offset; if (enable) { mmio_setbits_32(address, mask_on); } else { mmio_clrbits_32(address, mask_on); } } static void stm32mp1_hs_ocs_set(bool enable, uint32_t mask_on) { uint32_t offset = enable ? RCC_OCENSETR : RCC_OCENCLRR; uintptr_t address = stm32mp_rcc_base() + offset; mmio_write_32(address, mask_on); } static int stm32mp1_osc_wait(bool enable, uint32_t offset, uint32_t mask_rdy) { uint64_t timeout; uint32_t mask_test; uintptr_t address = stm32mp_rcc_base() + offset; if (enable) { mask_test = mask_rdy; } else { mask_test = 0; } timeout = timeout_init_us(OSCRDY_TIMEOUT); while ((mmio_read_32(address) & mask_rdy) != mask_test) { if (timeout_elapsed(timeout)) { ERROR("OSC %x @ %lx timeout for enable=%d : 0x%x\n", mask_rdy, address, enable, mmio_read_32(address)); return -ETIMEDOUT; } } return 0; } static void stm32mp1_lse_enable(bool bypass, bool digbyp, uint32_t lsedrv) { uint32_t value; uintptr_t rcc_base = stm32mp_rcc_base(); if (digbyp) { mmio_setbits_32(rcc_base + RCC_BDCR, RCC_BDCR_DIGBYP); } if (bypass || digbyp) { mmio_setbits_32(rcc_base + RCC_BDCR, RCC_BDCR_LSEBYP); } /* * Warning: not recommended to switch directly from "high drive" * to "medium low drive", and vice-versa. */ value = (mmio_read_32(rcc_base + RCC_BDCR) & RCC_BDCR_LSEDRV_MASK) >> RCC_BDCR_LSEDRV_SHIFT; while (value != lsedrv) { if (value > lsedrv) { value--; } else { value++; } mmio_clrsetbits_32(rcc_base + RCC_BDCR, RCC_BDCR_LSEDRV_MASK, value << RCC_BDCR_LSEDRV_SHIFT); } stm32mp1_ls_osc_set(true, RCC_BDCR, RCC_BDCR_LSEON); } static void stm32mp1_lse_wait(void) { if (stm32mp1_osc_wait(true, RCC_BDCR, RCC_BDCR_LSERDY) != 0) { VERBOSE("%s: failed\n", __func__); } } static void stm32mp1_lsi_set(bool enable) { stm32mp1_ls_osc_set(enable, RCC_RDLSICR, RCC_RDLSICR_LSION); if (stm32mp1_osc_wait(enable, RCC_RDLSICR, RCC_RDLSICR_LSIRDY) != 0) { VERBOSE("%s: failed\n", __func__); } } static void stm32mp1_hse_enable(bool bypass, bool digbyp, bool css) { uintptr_t rcc_base = stm32mp_rcc_base(); if (digbyp) { mmio_write_32(rcc_base + RCC_OCENSETR, RCC_OCENR_DIGBYP); } if (bypass || digbyp) { mmio_write_32(rcc_base + RCC_OCENSETR, RCC_OCENR_HSEBYP); } stm32mp1_hs_ocs_set(true, RCC_OCENR_HSEON); if (stm32mp1_osc_wait(true, RCC_OCRDYR, RCC_OCRDYR_HSERDY) != 0) { VERBOSE("%s: failed\n", __func__); } if (css) { mmio_write_32(rcc_base + RCC_OCENSETR, RCC_OCENR_HSECSSON); } } static void stm32mp1_csi_set(bool enable) { stm32mp1_hs_ocs_set(enable, RCC_OCENR_CSION); if (stm32mp1_osc_wait(enable, RCC_OCRDYR, RCC_OCRDYR_CSIRDY) != 0) { VERBOSE("%s: failed\n", __func__); } } static void stm32mp1_hsi_set(bool enable) { stm32mp1_hs_ocs_set(enable, RCC_OCENR_HSION); if (stm32mp1_osc_wait(enable, RCC_OCRDYR, RCC_OCRDYR_HSIRDY) != 0) { VERBOSE("%s: failed\n", __func__); } } static int stm32mp1_set_hsidiv(uint8_t hsidiv) { uint64_t timeout; uintptr_t rcc_base = stm32mp_rcc_base(); uintptr_t address = rcc_base + RCC_OCRDYR; mmio_clrsetbits_32(rcc_base + RCC_HSICFGR, RCC_HSICFGR_HSIDIV_MASK, RCC_HSICFGR_HSIDIV_MASK & (uint32_t)hsidiv); timeout = timeout_init_us(HSIDIV_TIMEOUT); while ((mmio_read_32(address) & RCC_OCRDYR_HSIDIVRDY) == 0U) { if (timeout_elapsed(timeout)) { ERROR("HSIDIV failed @ 0x%lx: 0x%x\n", address, mmio_read_32(address)); return -ETIMEDOUT; } } return 0; } static int stm32mp1_hsidiv(unsigned long hsifreq) { uint8_t hsidiv; uint32_t hsidivfreq = MAX_HSI_HZ; for (hsidiv = 0; hsidiv < 4U; hsidiv++) { if (hsidivfreq == hsifreq) { break; } hsidivfreq /= 2U; } if (hsidiv == 4U) { ERROR("Invalid clk-hsi frequency\n"); return -1; } if (hsidiv != 0U) { return stm32mp1_set_hsidiv(hsidiv); } return 0; } static bool stm32mp1_check_pll_conf(enum stm32mp1_pll_id pll_id, unsigned int clksrc, uint32_t *pllcfg, int plloff) { const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); uintptr_t rcc_base = stm32mp_rcc_base(); uintptr_t pllxcr = rcc_base + pll->pllxcr; enum stm32mp1_plltype type = pll->plltype; uintptr_t clksrc_address = rcc_base + (clksrc >> 4); unsigned long refclk; uint32_t ifrge = 0U; uint32_t src, value, fracv; /* Check PLL output */ if (mmio_read_32(pllxcr) != RCC_PLLNCR_PLLON) { return false; } /* Check current clksrc */ src = mmio_read_32(clksrc_address) & RCC_SELR_SRC_MASK; if (src != (clksrc & RCC_SELR_SRC_MASK)) { return false; } /* Check Div */ src = mmio_read_32(rcc_base + pll->rckxselr) & RCC_SELR_REFCLK_SRC_MASK; refclk = stm32mp1_clk_get_fixed(pll->refclk[src]) / (pllcfg[PLLCFG_M] + 1U); if ((refclk < (stm32mp1_pll[type].refclk_min * 1000000U)) || (refclk > (stm32mp1_pll[type].refclk_max * 1000000U))) { return false; } if ((type == PLL_800) && (refclk >= 8000000U)) { ifrge = 1U; } value = (pllcfg[PLLCFG_N] << RCC_PLLNCFGR1_DIVN_SHIFT) & RCC_PLLNCFGR1_DIVN_MASK; value |= (pllcfg[PLLCFG_M] << RCC_PLLNCFGR1_DIVM_SHIFT) & RCC_PLLNCFGR1_DIVM_MASK; value |= (ifrge << RCC_PLLNCFGR1_IFRGE_SHIFT) & RCC_PLLNCFGR1_IFRGE_MASK; if (mmio_read_32(rcc_base + pll->pllxcfgr1) != value) { return false; } /* Fractional configuration */ fracv = fdt_read_uint32_default(plloff, "frac", 0); value = fracv << RCC_PLLNFRACR_FRACV_SHIFT; value |= RCC_PLLNFRACR_FRACLE; if (mmio_read_32(rcc_base + pll->pllxfracr) != value) { return false; } /* Output config */ value = (pllcfg[PLLCFG_P] << RCC_PLLNCFGR2_DIVP_SHIFT) & RCC_PLLNCFGR2_DIVP_MASK; value |= (pllcfg[PLLCFG_Q] << RCC_PLLNCFGR2_DIVQ_SHIFT) & RCC_PLLNCFGR2_DIVQ_MASK; value |= (pllcfg[PLLCFG_R] << RCC_PLLNCFGR2_DIVR_SHIFT) & RCC_PLLNCFGR2_DIVR_MASK; if (mmio_read_32(rcc_base + pll->pllxcfgr2) != value) { return false; } return true; } static void stm32mp1_pll_start(enum stm32mp1_pll_id pll_id) { const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); uintptr_t pllxcr = stm32mp_rcc_base() + pll->pllxcr; /* Preserve RCC_PLLNCR_SSCG_CTRL value */ mmio_clrsetbits_32(pllxcr, RCC_PLLNCR_DIVPEN | RCC_PLLNCR_DIVQEN | RCC_PLLNCR_DIVREN, RCC_PLLNCR_PLLON); } static int stm32mp1_pll_output(enum stm32mp1_pll_id pll_id, uint32_t output) { const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); uintptr_t pllxcr = stm32mp_rcc_base() + pll->pllxcr; uint64_t timeout = timeout_init_us(PLLRDY_TIMEOUT); /* Wait PLL lock */ while ((mmio_read_32(pllxcr) & RCC_PLLNCR_PLLRDY) == 0U) { if (timeout_elapsed(timeout)) { ERROR("PLL%d start failed @ 0x%lx: 0x%x\n", pll_id, pllxcr, mmio_read_32(pllxcr)); return -ETIMEDOUT; } } /* Start the requested output */ mmio_setbits_32(pllxcr, output << RCC_PLLNCR_DIVEN_SHIFT); return 0; } static int stm32mp1_pll_stop(enum stm32mp1_pll_id pll_id) { const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); uintptr_t pllxcr = stm32mp_rcc_base() + pll->pllxcr; uint64_t timeout; /* Stop all output */ mmio_clrbits_32(pllxcr, RCC_PLLNCR_DIVPEN | RCC_PLLNCR_DIVQEN | RCC_PLLNCR_DIVREN); /* Stop PLL */ mmio_clrbits_32(pllxcr, RCC_PLLNCR_PLLON); timeout = timeout_init_us(PLLRDY_TIMEOUT); /* Wait PLL stopped */ while ((mmio_read_32(pllxcr) & RCC_PLLNCR_PLLRDY) != 0U) { if (timeout_elapsed(timeout)) { ERROR("PLL%d stop failed @ 0x%lx: 0x%x\n", pll_id, pllxcr, mmio_read_32(pllxcr)); return -ETIMEDOUT; } } return 0; } static void stm32mp1_pll_config_output(enum stm32mp1_pll_id pll_id, uint32_t *pllcfg) { const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); uintptr_t rcc_base = stm32mp_rcc_base(); uint32_t value; value = (pllcfg[PLLCFG_P] << RCC_PLLNCFGR2_DIVP_SHIFT) & RCC_PLLNCFGR2_DIVP_MASK; value |= (pllcfg[PLLCFG_Q] << RCC_PLLNCFGR2_DIVQ_SHIFT) & RCC_PLLNCFGR2_DIVQ_MASK; value |= (pllcfg[PLLCFG_R] << RCC_PLLNCFGR2_DIVR_SHIFT) & RCC_PLLNCFGR2_DIVR_MASK; mmio_write_32(rcc_base + pll->pllxcfgr2, value); } static int stm32mp1_pll_config(enum stm32mp1_pll_id pll_id, uint32_t *pllcfg, uint32_t fracv) { const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); uintptr_t rcc_base = stm32mp_rcc_base(); enum stm32mp1_plltype type = pll->plltype; unsigned long refclk; uint32_t ifrge = 0; uint32_t src, value; src = mmio_read_32(rcc_base + pll->rckxselr) & RCC_SELR_REFCLK_SRC_MASK; refclk = stm32mp1_clk_get_fixed(pll->refclk[src]) / (pllcfg[PLLCFG_M] + 1U); if ((refclk < (stm32mp1_pll[type].refclk_min * 1000000U)) || (refclk > (stm32mp1_pll[type].refclk_max * 1000000U))) { return -EINVAL; } if ((type == PLL_800) && (refclk >= 8000000U)) { ifrge = 1U; } value = (pllcfg[PLLCFG_N] << RCC_PLLNCFGR1_DIVN_SHIFT) & RCC_PLLNCFGR1_DIVN_MASK; value |= (pllcfg[PLLCFG_M] << RCC_PLLNCFGR1_DIVM_SHIFT) & RCC_PLLNCFGR1_DIVM_MASK; value |= (ifrge << RCC_PLLNCFGR1_IFRGE_SHIFT) & RCC_PLLNCFGR1_IFRGE_MASK; mmio_write_32(rcc_base + pll->pllxcfgr1, value); /* Fractional configuration */ value = 0; mmio_write_32(rcc_base + pll->pllxfracr, value); value = fracv << RCC_PLLNFRACR_FRACV_SHIFT; mmio_write_32(rcc_base + pll->pllxfracr, value); value |= RCC_PLLNFRACR_FRACLE; mmio_write_32(rcc_base + pll->pllxfracr, value); stm32mp1_pll_config_output(pll_id, pllcfg); return 0; } static void stm32mp1_pll_csg(enum stm32mp1_pll_id pll_id, uint32_t *csg) { const struct stm32mp1_clk_pll *pll = pll_ref(pll_id); uint32_t pllxcsg = 0; pllxcsg |= (csg[PLLCSG_MOD_PER] << RCC_PLLNCSGR_MOD_PER_SHIFT) & RCC_PLLNCSGR_MOD_PER_MASK; pllxcsg |= (csg[PLLCSG_INC_STEP] << RCC_PLLNCSGR_INC_STEP_SHIFT) & RCC_PLLNCSGR_INC_STEP_MASK; pllxcsg |= (csg[PLLCSG_SSCG_MODE] << RCC_PLLNCSGR_SSCG_MODE_SHIFT) & RCC_PLLNCSGR_SSCG_MODE_MASK; mmio_write_32(stm32mp_rcc_base() + pll->pllxcsgr, pllxcsg); mmio_setbits_32(stm32mp_rcc_base() + pll->pllxcr, RCC_PLLNCR_SSCG_CTRL); } static int stm32mp1_set_clksrc(unsigned int clksrc) { uintptr_t clksrc_address = stm32mp_rcc_base() + (clksrc >> 4); uint64_t timeout; mmio_clrsetbits_32(clksrc_address, RCC_SELR_SRC_MASK, clksrc & RCC_SELR_SRC_MASK); timeout = timeout_init_us(CLKSRC_TIMEOUT); while ((mmio_read_32(clksrc_address) & RCC_SELR_SRCRDY) == 0U) { if (timeout_elapsed(timeout)) { ERROR("CLKSRC %x start failed @ 0x%lx: 0x%x\n", clksrc, clksrc_address, mmio_read_32(clksrc_address)); return -ETIMEDOUT; } } return 0; } static int stm32mp1_set_clkdiv(unsigned int clkdiv, uintptr_t address) { uint64_t timeout; mmio_clrsetbits_32(address, RCC_DIVR_DIV_MASK, clkdiv & RCC_DIVR_DIV_MASK); timeout = timeout_init_us(CLKDIV_TIMEOUT); while ((mmio_read_32(address) & RCC_DIVR_DIVRDY) == 0U) { if (timeout_elapsed(timeout)) { ERROR("CLKDIV %x start failed @ 0x%lx: 0x%x\n", clkdiv, address, mmio_read_32(address)); return -ETIMEDOUT; } } return 0; } static void stm32mp1_mco_csg(uint32_t clksrc, uint32_t clkdiv) { uintptr_t clksrc_address = stm32mp_rcc_base() + (clksrc >> 4); /* * Binding clksrc : * bit15-4 offset * bit3: disable * bit2-0: MCOSEL[2:0] */ if ((clksrc & 0x8U) != 0U) { mmio_clrbits_32(clksrc_address, RCC_MCOCFG_MCOON); } else { mmio_clrsetbits_32(clksrc_address, RCC_MCOCFG_MCOSRC_MASK, clksrc & RCC_MCOCFG_MCOSRC_MASK); mmio_clrsetbits_32(clksrc_address, RCC_MCOCFG_MCODIV_MASK, clkdiv << RCC_MCOCFG_MCODIV_SHIFT); mmio_setbits_32(clksrc_address, RCC_MCOCFG_MCOON); } } static void stm32mp1_set_rtcsrc(unsigned int clksrc, bool lse_css) { uintptr_t address = stm32mp_rcc_base() + RCC_BDCR; if (((mmio_read_32(address) & RCC_BDCR_RTCCKEN) == 0U) || (clksrc != (uint32_t)CLK_RTC_DISABLED)) { mmio_clrsetbits_32(address, RCC_BDCR_RTCSRC_MASK, clksrc << RCC_BDCR_RTCSRC_SHIFT); mmio_setbits_32(address, RCC_BDCR_RTCCKEN); } if (lse_css) { mmio_setbits_32(address, RCC_BDCR_LSECSSON); } } static void stm32mp1_stgen_config(void) { uintptr_t stgen; uint32_t cntfid0; unsigned long rate; unsigned long long counter; stgen = fdt_get_stgen_base(); cntfid0 = mmio_read_32(stgen + CNTFID_OFF); rate = get_clock_rate(stm32mp1_clk_get_parent(STGEN_K)); if (cntfid0 == rate) { return; } mmio_clrbits_32(stgen + CNTCR_OFF, CNTCR_EN); counter = (unsigned long long)mmio_read_32(stgen + CNTCVL_OFF); counter |= ((unsigned long long)mmio_read_32(stgen + CNTCVU_OFF)) << 32; counter = (counter * rate / cntfid0); mmio_write_32(stgen + CNTCVL_OFF, (uint32_t)counter); mmio_write_32(stgen + CNTCVU_OFF, (uint32_t)(counter >> 32)); mmio_write_32(stgen + CNTFID_OFF, rate); mmio_setbits_32(stgen + CNTCR_OFF, CNTCR_EN); write_cntfrq((u_register_t)rate); /* Need to update timer with new frequency */ generic_delay_timer_init(); } void stm32mp1_stgen_increment(unsigned long long offset_in_ms) { uintptr_t stgen; unsigned long long cnt; stgen = fdt_get_stgen_base(); cnt = ((unsigned long long)mmio_read_32(stgen + CNTCVU_OFF) << 32) | mmio_read_32(stgen + CNTCVL_OFF); cnt += (offset_in_ms * mmio_read_32(stgen + CNTFID_OFF)) / 1000U; mmio_clrbits_32(stgen + CNTCR_OFF, CNTCR_EN); mmio_write_32(stgen + CNTCVL_OFF, (uint32_t)cnt); mmio_write_32(stgen + CNTCVU_OFF, (uint32_t)(cnt >> 32)); mmio_setbits_32(stgen + CNTCR_OFF, CNTCR_EN); } static void stm32mp1_pkcs_config(uint32_t pkcs) { uintptr_t address = stm32mp_rcc_base() + ((pkcs >> 4) & 0xFFFU); uint32_t value = pkcs & 0xFU; uint32_t mask = 0xFU; if ((pkcs & BIT(31)) != 0U) { mask <<= 4; value <<= 4; } mmio_clrsetbits_32(address, mask, value); } int stm32mp1_clk_init(void) { uintptr_t rcc_base = stm32mp_rcc_base(); unsigned int clksrc[CLKSRC_NB]; unsigned int clkdiv[CLKDIV_NB]; unsigned int pllcfg[_PLL_NB][PLLCFG_NB]; int plloff[_PLL_NB]; int ret, len; enum stm32mp1_pll_id i; bool lse_css = false; bool pll3_preserve = false; bool pll4_preserve = false; bool pll4_bootrom = false; const fdt32_t *pkcs_cell; /* Check status field to disable security */ if (!fdt_get_rcc_secure_status()) { mmio_write_32(rcc_base + RCC_TZCR, 0); } ret = fdt_rcc_read_uint32_array("st,clksrc", clksrc, (uint32_t)CLKSRC_NB); if (ret < 0) { return -FDT_ERR_NOTFOUND; } ret = fdt_rcc_read_uint32_array("st,clkdiv", clkdiv, (uint32_t)CLKDIV_NB); if (ret < 0) { return -FDT_ERR_NOTFOUND; } for (i = (enum stm32mp1_pll_id)0; i < _PLL_NB; i++) { char name[12]; snprintf(name, sizeof(name), "st,pll@%d", i); plloff[i] = fdt_rcc_subnode_offset(name); if (!fdt_check_node(plloff[i])) { continue; } ret = fdt_read_uint32_array(plloff[i], "cfg", pllcfg[i], (int)PLLCFG_NB); if (ret < 0) { return -FDT_ERR_NOTFOUND; } } stm32mp1_mco_csg(clksrc[CLKSRC_MCO1], clkdiv[CLKDIV_MCO1]); stm32mp1_mco_csg(clksrc[CLKSRC_MCO2], clkdiv[CLKDIV_MCO2]); /* * Switch ON oscillator found in device-tree. * Note: HSI already ON after BootROM stage. */ if (stm32mp1_osc[_LSI] != 0U) { stm32mp1_lsi_set(true); } if (stm32mp1_osc[_LSE] != 0U) { bool bypass, digbyp; uint32_t lsedrv; bypass = fdt_osc_read_bool(_LSE, "st,bypass"); digbyp = fdt_osc_read_bool(_LSE, "st,digbypass"); lse_css = fdt_osc_read_bool(_LSE, "st,css"); lsedrv = fdt_osc_read_uint32_default(_LSE, "st,drive", LSEDRV_MEDIUM_HIGH); stm32mp1_lse_enable(bypass, digbyp, lsedrv); } if (stm32mp1_osc[_HSE] != 0U) { bool bypass, digbyp, css; bypass = fdt_osc_read_bool(_HSE, "st,bypass"); digbyp = fdt_osc_read_bool(_HSE, "st,digbypass"); css = fdt_osc_read_bool(_HSE, "st,css"); stm32mp1_hse_enable(bypass, digbyp, css); } /* * CSI is mandatory for automatic I/O compensation (SYSCFG_CMPCR) * => switch on CSI even if node is not present in device tree */ stm32mp1_csi_set(true); /* Come back to HSI */ ret = stm32mp1_set_clksrc(CLK_MPU_HSI); if (ret != 0) { return ret; } ret = stm32mp1_set_clksrc(CLK_AXI_HSI); if (ret != 0) { return ret; } ret = stm32mp1_set_clksrc(CLK_MCU_HSI); if (ret != 0) { return ret; } if ((mmio_read_32(rcc_base + RCC_MP_RSTSCLRR) & RCC_MP_RSTSCLRR_MPUP0RSTF) != 0) { pll3_preserve = stm32mp1_check_pll_conf(_PLL3, clksrc[CLKSRC_PLL3], pllcfg[_PLL3], plloff[_PLL3]); pll4_preserve = stm32mp1_check_pll_conf(_PLL4, clksrc[CLKSRC_PLL4], pllcfg[_PLL4], plloff[_PLL4]); } for (i = (enum stm32mp1_pll_id)0; i < _PLL_NB; i++) { if (((i == _PLL3) && pll3_preserve) || ((i == _PLL4) && pll4_preserve)) { continue; } ret = stm32mp1_pll_stop(i); if (ret != 0) { return ret; } } /* Configure HSIDIV */ if (stm32mp1_osc[_HSI] != 0U) { ret = stm32mp1_hsidiv(stm32mp1_osc[_HSI]); if (ret != 0) { return ret; } stm32mp1_stgen_config(); } /* Select DIV */ /* No ready bit when MPUSRC != CLK_MPU_PLL1P_DIV, MPUDIV is disabled */ mmio_write_32(rcc_base + RCC_MPCKDIVR, clkdiv[CLKDIV_MPU] & RCC_DIVR_DIV_MASK); ret = stm32mp1_set_clkdiv(clkdiv[CLKDIV_AXI], rcc_base + RCC_AXIDIVR); if (ret != 0) { return ret; } ret = stm32mp1_set_clkdiv(clkdiv[CLKDIV_APB4], rcc_base + RCC_APB4DIVR); if (ret != 0) { return ret; } ret = stm32mp1_set_clkdiv(clkdiv[CLKDIV_APB5], rcc_base + RCC_APB5DIVR); if (ret != 0) { return ret; } ret = stm32mp1_set_clkdiv(clkdiv[CLKDIV_MCU], rcc_base + RCC_MCUDIVR); if (ret != 0) { return ret; } ret = stm32mp1_set_clkdiv(clkdiv[CLKDIV_APB1], rcc_base + RCC_APB1DIVR); if (ret != 0) { return ret; } ret = stm32mp1_set_clkdiv(clkdiv[CLKDIV_APB2], rcc_base + RCC_APB2DIVR); if (ret != 0) { return ret; } ret = stm32mp1_set_clkdiv(clkdiv[CLKDIV_APB3], rcc_base + RCC_APB3DIVR); if (ret != 0) { return ret; } /* No ready bit for RTC */ mmio_write_32(rcc_base + RCC_RTCDIVR, clkdiv[CLKDIV_RTC] & RCC_DIVR_DIV_MASK); /* Configure PLLs source */ ret = stm32mp1_set_clksrc(clksrc[CLKSRC_PLL12]); if (ret != 0) { return ret; } if (!pll3_preserve) { ret = stm32mp1_set_clksrc(clksrc[CLKSRC_PLL3]); if (ret != 0) { return ret; } } if (!pll4_preserve) { ret = stm32mp1_set_clksrc(clksrc[CLKSRC_PLL4]); if (ret != 0) { return ret; } } /* Configure and start PLLs */ for (i = (enum stm32mp1_pll_id)0; i < _PLL_NB; i++) { uint32_t fracv; uint32_t csg[PLLCSG_NB]; if (((i == _PLL3) && pll3_preserve) || ((i == _PLL4) && pll4_preserve && !pll4_bootrom)) { continue; } if (!fdt_check_node(plloff[i])) { continue; } if ((i == _PLL4) && pll4_bootrom) { /* Set output divider if not done by the Bootrom */ stm32mp1_pll_config_output(i, pllcfg[i]); continue; } fracv = fdt_read_uint32_default(plloff[i], "frac", 0); ret = stm32mp1_pll_config(i, pllcfg[i], fracv); if (ret != 0) { return ret; } ret = fdt_read_uint32_array(plloff[i], "csg", csg, (uint32_t)PLLCSG_NB); if (ret == 0) { stm32mp1_pll_csg(i, csg); } else if (ret != -FDT_ERR_NOTFOUND) { return ret; } stm32mp1_pll_start(i); } /* Wait and start PLLs ouptut when ready */ for (i = (enum stm32mp1_pll_id)0; i < _PLL_NB; i++) { if (!fdt_check_node(plloff[i])) { continue; } ret = stm32mp1_pll_output(i, pllcfg[i][PLLCFG_O]); if (ret != 0) { return ret; } } /* Wait LSE ready before to use it */ if (stm32mp1_osc[_LSE] != 0U) { stm32mp1_lse_wait(); } /* Configure with expected clock source */ ret = stm32mp1_set_clksrc(clksrc[CLKSRC_MPU]); if (ret != 0) { return ret; } ret = stm32mp1_set_clksrc(clksrc[CLKSRC_AXI]); if (ret != 0) { return ret; } ret = stm32mp1_set_clksrc(clksrc[CLKSRC_MCU]); if (ret != 0) { return ret; } stm32mp1_set_rtcsrc(clksrc[CLKSRC_RTC], lse_css); /* Configure PKCK */ pkcs_cell = fdt_rcc_read_prop("st,pkcs", &len); if (pkcs_cell != NULL) { bool ckper_disabled = false; uint32_t j; for (j = 0; j < ((uint32_t)len / sizeof(uint32_t)); j++) { uint32_t pkcs = fdt32_to_cpu(pkcs_cell[j]); if (pkcs == (uint32_t)CLK_CKPER_DISABLED) { ckper_disabled = true; continue; } stm32mp1_pkcs_config(pkcs); } /* * CKPER is source for some peripheral clocks * (FMC-NAND / QPSI-NOR) and switching source is allowed * only if previous clock is still ON * => deactivated CKPER only after switching clock */ if (ckper_disabled) { stm32mp1_pkcs_config(CLK_CKPER_DISABLED); } } /* Switch OFF HSI if not found in device-tree */ if (stm32mp1_osc[_HSI] == 0U) { stm32mp1_hsi_set(false); } stm32mp1_stgen_config(); /* Software Self-Refresh mode (SSR) during DDR initilialization */ mmio_clrsetbits_32(rcc_base + RCC_DDRITFCR, RCC_DDRITFCR_DDRCKMOD_MASK, RCC_DDRITFCR_DDRCKMOD_SSR << RCC_DDRITFCR_DDRCKMOD_SHIFT); return 0; } static void stm32mp1_osc_clk_init(const char *name, enum stm32mp_osc_id index) { uint32_t frequency; if (fdt_osc_read_freq(name, &frequency) == 0) { stm32mp1_osc[index] = frequency; } } static void stm32mp1_osc_init(void) { enum stm32mp_osc_id i; for (i = (enum stm32mp_osc_id)0 ; i < NB_OSC; i++) { stm32mp1_osc_clk_init(stm32mp_osc_node_label[i], i); } } int stm32mp1_clk_probe(void) { stm32mp1_osc_init(); return 0; }